ABOVE LIVESTREAM:A United Launch Alliance Atlas V 401 will launch Orbital ATK’s Cygnus™ spacecraft on the initial leg of its cargo resupply mission to the International Space Station (ISS).

BREVARD COUNTY, FLORIDA — A United Launch Alliance Atlas V 401 will launch the Orbital ATK’s Cygnus spacecraft on the initial leg of its cargo resupply mission to the International Space Station (ISS).

Rocket/Payload: A United Launch Alliance Atlas V 401 will launch Orbital ATK’s Cygnus™ spacecraft on the initial leg of its cargo resupply mission to the International Space Station (ISS).

Viewing the Launch by Webcast: The live webcast will begin at 4:30 p.m. EST.

Mission Description:Cygnus is a low-risk design incorporating elements drawn from Orbital ATK and its partners’ existing, flight-proven spacecraft technologies. Cygnus consists of a common Service Module (SM) and a Pressurized Cargo Module (PCM). The SM is assembled and tested at Orbital ATK’s Dulles, Virginia, satellite manufacturing facility and incorporates systems from Orbital ATK’s flight-proven LEOStar™ and GEOStar™ satellite product lines. The PCM is based on the Multi-Purpose Logistics Module (MPLM), developed and built by Thales Alenia Space of Italy.

The Cygnus spacecraft for the OA-4 mission is the first to employ the longer, “enhanced,” PCM which can carry a greater volume of cargo than the PCM flown on previous missions, and lightweight UltraFlex arrays developed and built by Orbital ATK’s Goleta, California, facility.

Launch Notes: OA-4 will mark the 60th launch of the Atlas V and the 30th launch in the 401 configuration. It also marks ULA’s first mission supporting ISS cargo resupply.